为什么ConcurrentDictionary.TryRemove需要第二个说法出来？

问题描述

我只希望可以删除该值。我不需要事后使用变量。为什么不包括在这里是不需要第二个参数的重载？

I only want to remove a value.. I don't need to use the variable afterwards. Why not include an overload where this second parameter was not required?

难道我真的只是存储在一个临时的局部变量，而不是使用它，并有垃圾收藏家收集它，当方法结束？似乎是相当愚蠢的。

Do I really have to just store it in a temporary local variable, not use it, and have the garbage collector collect it when the method ends? Seems rather silly..

功能：

推荐答案

您可以创建正是你想要的方式：

You can create exactly the method you want:

public static class ConcurrentDictionaryEx {
  public static bool TryRemove<TKey, TValue>(
    this ConcurrentDictionary<TKey, TValue> self, TKey key) {
    TValue ignored;
    return self.TryRemove(key, out ignored);
  }
}

更新：或者，作为，只是使用的。但需要注意的是，因为它是一个显式接口实现，你需要参考的的IDictionary< TKEY的，TValue> ，从而导致你回到创建扩展方法，如果您要避免铸造 ConcurrentDictionary< TKEY的，TValue> 引用：

UPDATE: Or, as Dialecticus mentioned in the comments, just use Remove. But note that, since it's an explicit interface implementation, you'll need a reference to an IDictionary<TKey, TValue>, which leads you back to creating an extension method if you want to avoid casting a ConcurrentDictionary<TKey, TValue> reference:

public static class ConcurrentDictionaryEx {
  public static bool Remove<TKey, TValue>(
    this ConcurrentDictionary<TKey, TValue> self, TKey key) {
      return ((IDictionary<TKey, TValue>)self).Remove(key);
  }
}

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